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低功耗蓝牙扩展一次最多能发多少个字节 - App Inventor 2 拓展 - 清泛IT社...

如题,请问下 低功耗蓝牙扩展一次最多能发多少个字节?{:8_413:}见这篇帖子《ble蓝牙 RequestMTU 请求没有反应?设置没有生效?》
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Hiding user input on terminal in Linux script

... (using andreas' read -s solution): unset password; while IFS= read -r -s -n1 pass; do if [[ -z $pass ]]; then echo break else echo -n '*' password+=$pass fi done Without being fancy echo "Please enter your username"; read username; echo "Please enter your password"; stty...
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Insert a line at specific line number with sed or awk

...' sed: 1: "2i1.5": command i expects \ followed by text $ seq 3|sed $'2i\\\n1.5' 1 1.52 3 $ seq 3|sed $'2i\\\n1.5\n' 1 1.5 2 3 To replace a line, you can use the c (change) or s (substitute) commands with a numeric address: $ seq 3|sed $'2c\\\n1.5\n' 1 1.5 3 $ seq 3|gsed '2c1.5' 1 1.5 3 $ seq 3|s...
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莱昂氏unix源代码析 PDF - 文档下载 - 清泛网 - 专注C/C++及内核技术

莱昂氏unix源代码析 PDF莱昂 源代码本书由上、下两篇组成。上篇为UNIX版本6的源代码,下篇是莱昂先生对UNIX操作系统版本6源代码的详细析。本书语言简洁、透彻,曾作为未公开...本书由上、下两篇组成。上篇为UNIX版本6的源...
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Script to get the HTTP status code of a list of urls?

... no brainer in bash if you use xargs for the call. Here the code: xargs -n1 -P 10 curl -o /dev/null --silent --head --write-out '%{url_effective}: %{http_code}\n' < url.lst -n1: use just one value (from the list) as argument to the curl call -P10: Keep 10 curl processes alive at any time (i....
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移动前端开发之viewport的深入理解 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...,辨率也是五花八门,安卓设备上的一个css像素相当于多少个屏幕物理像素,也因设备的不同而不同,没有一个定论。 还有一个因素也会引起css中px的变化,那就是用户缩放。例如,当用户把页面放大一倍,那么css中1px所...
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How to create a CPU spike with a bash command

... To load 3 cores for 5 seconds: seq 3 | xargs -P0 -n1 timeout 5 yes > /dev/null This results in high kernel (sys) load from the many write() system calls. If you prefer mostly userland cpu load: seq 3 | xargs -P0 -n1 timeout 5 md5sum /dev/zero If you just want the l...
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Sql server默认的端口是多少?如何开启远程连接? - 爬虫/数据库 - 清泛IT...

默认是1433,可以在配置管理器中查看: 需要开放1433端口,可以参考《Windows、Linux开放指定端口》。 另外,开启远程连接还需要启用TCP/IP,然后重启服务,步骤如下:
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Move entire line up and down in Vim

...ther inside .vimrc or ~/.vim/plugin/swap_lines.vim function! s:swap_lines(n1, n2) let line1 = getline(a:n1) let line2 = getline(a:n2) call setline(a:n1, line2) call setline(a:n2, line1) endfunction function! s:swap_up() let n = line('.') if n == 1 return endif ...
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Win32汇编--使用MASM - C/C++ - 清泛网 - 专注C/C++及内核技术

... db ‘World’,0 那么sizeof szHello是多少呢?注意!是7而不是13,MASM中的变量定义只认一行,后一行db ‘World’,0实际上是另一个没有名称的数据定义,编译器认为sizeof szHello是第一行字符的数量。虽然...